Unable to connect Linux computer to Dlink DI-624 router due to ipv6

December 28, 2006 at 3:17 am Leave a comment

Recently, I installed Ubuntu 6.06 on an old laptop. Much to my surprise, the Dlink DWL-G650 wireless card was recognized. Much to my annoyance, the wireless did not work. Here’s what I did to fix the problem. I open up a terminal window and type iwconfig.

lo no wireless extensions.

eth0 no wireless extensions.

ath0 IEEE 802.11 ESSID:””
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power:20 dBm Sensitivity=0/3
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=0/94 Signal level=-95 dBm Noise level=-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

sit0 no wireless extensions.

From the result, it would appear that the drivers were found and loaded (or we won’t be getting ath0). The access point “Not-Associated” is more troubling though. I selected System->Admin->Networking and the network card and looked at the Ath0 properties. I had enter the WEP earlier, but I realized that I had enter the WEP Key in hex but set the type to ASCII. I was sending the wrong key (note that I had also set properties to use DHCP).

With the correct key, I enter iwconfig again:

lo no wireless extensions.

eth0 no wireless extensions.

ath0 IEEE 802.11g ESSID:”Literbox”
Mode:Managed Frequency:2.422 GHz Access Point: 00:12:59:19:17:5E
Bit Rate:48 Mb/s Tx-Power:18 dBm Sensitivity=0/3
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=13/94 Signal level=-82 dBm Noise level=-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

sit0 no wireless extensions.

Now notice the access point’s MAC address is returned. However, the wireless is still not working. I did a dmesg and see the following error message:

[17179906.596000] ath0: no IPv6 routers present
[17179931.316000] ath0: no IPv6 routers present

So what seems that the router a Dlink DI-624 Rev C is not compatible with IPv6 protocol. I am assuming this because I can’t find any info on the Dlink website, but some site indicated that DI-624 Rev D handled ipv6. In any case, this mean I have to turn off ipv6. Follow the instruction on this link to disable ipv6.

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